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问题 单项选择题

图为某区域地质剖面示意图。导致图中甲处岩层顶部缺失的原因是（）

A、背斜的底部岩性疏松被侵蚀而成

B、向斜的顶部岩性疏松被侵蚀而成

C、背斜的顶部岩性坚硬被侵蚀而成

D、背斜的顶部岩性疏松被侵蚀而成

答案

参考答案：D

解析：

从地层弯曲方向判读，甲地的地质构造为背斜，背斜顶部岩性疏松容易被侵蚀，故排除B、C两项；背斜顶部向上拱起，岩石性质疏松，容易被外力所侵蚀，故D项正确。

【点评】地质构造及其地貌，三大类岩石的形成

选择题

下列选项中，可以遗传给后代的变异是指（    ）

①外界环境改变所引起的变异 ②基因改变引起的变异

③染色体数目改变的变异     ④遗传物质改变引起的变异

A．①②③

B．②③④

C．①③④

D．①②④
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问答题

Lorna is a final year art student at the National College of Art and Design. Since September 2006 Lorna would, from time to time, make various pieces of jewellery as gifts for her friends and sometimes they would ask her to make a specific piece. Her friends would then pay her for the piece, the amount paid was usually decided upon by her friends and not Lorna.Since September 2008 Lorna has begun to increase her range and sales of jewellery. She continues to sell through a network of friends and relations. Lorna also recently purchased a small stock of beads, stones, glass and other materials. She now prices the item, herself, rather than leaving it up to the individual to set the price.Recently Lorna’s brother who is a trainee accountant has told her that she may have an income tax liability arising from the sale of the jewellery. Lorna is concerned at this as she believed this was her hobby.Required:

(b) State, giving reasons, whether in your opinion Lorna would be regarded as carrying on a trade and if so, the extent of any tax liability. (4 marks)
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